<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    .father {
      width: 300px;
      height: 300px;
      background-color: pink;
    }
    .som {
      width: 100px;
      height: 100px;
      background-color: skyblue;
      margin-top: 50px;
      display: inline-block;
    }
  </style>
</head>
<body>
<div class="father">
  <div class="son">son</div>
</div>
</body>
</html>
